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DNA Structure and Replication

DNA Structure and Replication
DNA with a G-C content of 50% will melt at approximately

100 °C
60°C
90 °C
70 °C

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DNA Structure and Replication
What does ligase do during replication of DNA?

Synthesizes the lagging strand
Joins nicks in DNA strands
Makes copies of mRNA from DNA
Digests mRNA when it is no longer needed

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DNA Structure and Replication
What is the only common methylation in the DNA of eukaryotes?

None of these
Adenosine in GpA dinucleotides
Cytosine in CpG dinucleotides
Guanosine in ApGpA trinucleotides

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DNA Structure and Replication
DNA helicase is used to

break a phosphodiester bond in DNA strand
unwind the double helix
interact the double helix closely
None of these

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DNA Structure and Replication
One hypothesis of DNA replication suggested that the parental DNA molecules are broken into fragments. Both strands of DNA in each of the daughter molecules are made up of an assortment of parental and new DNA. This statement refers to which hypothesis?

Evolutionary theory
Semi-conservative theory
Dispersive theory
Conservative theory

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DNA Structure and Replication
The DNA is negatively super coiled, complexes to histone,

H-NS
HU
HSP-1
All of these

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